Commutator-truing device



May 7, 1929. H. SHAPAN COMMUTATOR TRUING DEVICE Filed June 1927 3 Sheets-Sheet Inventor Henry Sha na,

Attornqy May 7, 1929. r H. SHAPAN 1,712,053

COMMUTATOR TRUING DEVICE Filed June 1927 3 Sheets-Sheet 2 Henry Shafan Attorney y 7, 1929' H. SHAPAN COMMUTATOR TRUING DEVICE Filed June .4, 1927 3 Sheets-Sheet s Patented May 7, 1929.

HENRY SHAPAN, or BROOKLYN, NEW YORK.

, OOLIMUTATOR-TRUING DEVICE.

Applieatien filed. June 4, 1827. Serial No. 196,462.

The present invention relates to a device for truing commutators'and has for its prlneipal object to provide a simple and QlllClGIll) device which may be readily and easlly assembled for use and which will furthermore be adapted for disposition on the armature shaft after the front hearing has been removed thereby permitting the commutator to be operated upon without requiring the removal of the commutator from the motor.

One of the important objects of the present invention is to provide a commutator truing device of the above mentioned character wherein the same includes a head stock which is adapted for rotation onthe armature shatt, a tool carriage being arranged on the head stock for slidable movement thereon, means being'provided for seating the tool carria ge whereby the cutter will be moved along tne connnutator, additional means being providcd for automatically operating the feeding mechanism during the rotation of the head stock about the armature shaft.

A still further object is to provide a conimutator truing device of the above mentioned character which is simple {in construction, inexpensive, and furthermore adapted to the purposes for which the same is designed.

Other objects and advantages of this invention will become apparent during the course of the following description.

In the accompanying drawings forming part of this specification and in which like numerals are en'iployed to designate like parts throughout the same:

Figure 1 is a side elevation or the conimue tater truing' device embodying my invent on showing; the same in use. I

w- Y I r 1 1 l iguie 2 is an end elevation b16100. Figure 3 is a top'plan view of the device, parts thereof being broken away.

Figure tis a verticalsectional view taken.

substantially on the line 4-4: of Figure 2 looking in thedirection of the arrow.

Figure 5 is a similar section taken on the line 5-5 of Figure 1 looking in the direction of the arrows. i 1

Figure 6 is a top plan view of the top section ot the sectional head stock.

Figure 7 is a sectional view taken substantially on the line 77 of Figure 1 looking in the direction of the arrows tool carriage.

Figure 9 is a detail perspective view of the worm'shaftforming a part of the carriage seating means. i I

FigurelO is a detail'of thepawl showing the ratchet wheel associated therewith.

Figure llis a detail perspective View oft a shim.

In the drawings wherein for the purpose of illustration is shown the preferred embodiment of my invention the numeral 1 designates generally the head stock, the same 'eomprising a complementary top and bottom sectionQ and 3 respectively. The top section is preferably in the form of a block and, 1s

lor'med with a substantially V-shaped cutout portion in the bottom thereof whilethe bottom section in'the form of it'SUlJSlJELIP tially V-shaped plate member.-

Laterally extending flanges tare formed on the bottom ofthe top section 2 while similar flanges 5 extend outwardly from the top of thebottoin section 3 at the side thereof and these complementary flanges are provided with registering openings to accommodate the securing bolts (5 whereby thetop and bottom sections of the head stock may be. clamped around the armature shaft A after the trontbearing thereof has been removed. The sections of the head stock are notclamped on thearmature shaft so thatthe headstock is not free to move and this head stock is adapted tor rotation about the armature handlesB; and similar threaded sockets are "ltorinei'il in the bottom section 3 for aceommodatingthe inner threaded endsof additional handles and .in-this manner, the handles 8 will extend radially tromthe head stock 1, in the manner as clearlyillustrated in Figure 5. These handles provide means where by the headstock may bemanually rotated about the armature shaft. I

The block comprising the, top section'2 of the head stock 1 is formed'in its upper face with the longitudinally extending. handle or slot 9 which provides a guide means for acconnnodating the longitudinally movable tool carriage the construction of which will novvybe specifically described. i i 1 This tool carriage comprises an elongated bar lO which is of such cross sectional shape as to cooperatewiththe longitudinal guide channel or slot 9 :lormed in thetopof the block comprising the upper section of the head stock 1 which is clearly illustrated in Figures 2 and 5 of the drawings. The forward end of the bar is slotted as inclicated at 11 with reference more particularly to Figure 8 and secured within this slot is the cutting tool 12, the same being supported in proper position in the slot by means of the transversely extending screw or bolt 13 which is threaded through a suitable opening- 14 provided therefor in one of the furcations formed by the slot 11.

The bottom face of this bar 10 comprising the traveling carriage is formed with transversely curved cut-out portion and this portion of the bar is formed with the thread or rather teeth 15 in the manner as clearly illustrated in Figures l and 7 of the drawings. T he purpose of the teeth 15 formed in the bottom face of the bar 10 will also be presently described.

The block comprising the top section 2 is provided with a. channel 16 which extends inwardly from the rear end of the block and is formed in the bottom of the channel 9 to accommodate the forward end of the worm shaft 17 The forward end portion of the worm shaft is circular in cross section while the outer end portion which extends beyond the rear end of the block is of hexagonal shape as indicated at 18 with reference more particularly to Figure 9 of the drawings. The block is further formed with the cut-out portion 19 in the bottom of the channel 9 and this cut-out portion 19 intersects the cut-out portion 16 as clearly illustrated in Figure 6' of the drawings.

The circular inner end portion of the worm shaft 17 carries thereon the worm gear 20 and the same is adapted for disposition within the cut-out portion 19 in the manner as clearly shown in Figure 4. This worm is integrally ussocia ed with the shaft 1'? whereby the same rotates simultaneously with the shaft and the worm is adapted for cooperation with the teeth 15 formed in the bottom face of the bar 10 in the manner as clearly shown in Figure 4. I

The worm 20 cooperates with the teeth 15 to provide a feeding means for moving the bar 10 forwardly whereby the cutter 12 will be fed along the outer peripheral face of the commutator B which is to be trued and for the purpose of automatically operating the feeding mechanism there is provided a pawl and. ratchet structure the details of which will now be fully described.

An enlarged toothed member 21 is disposed over the out-er end portion of the armature shaft A and for the purpose of securing this toothed member rigidly on the shaft there is provided an annular collar or flange 22 on the inner face of this toothed member and suitable set screws or the like 23 extend through the flange or collar and engage the armature shaft in the manner as is very clearly illustrated in Figure 4 of the drawing. The toothed member 21 is adapted for disposition adjacent the rear end of the rotatable head stock 1. v

Cooperating with the toothed member 21 is the pawl designated generally by the numeral 2 1 which is operatively associated with the hexagonal outer end portion 19 of the worm shaft 17. This pawl comprises apairof similar plates each of which has itssides gradually converging toward the lower end and the smaller lower end portions of these plates are disposed in abutting relation while the larger upper end portions thereof are disposed in parallel spaced relation in the manner as clearly shown in Figures 1 and 4 of he dra Each plate is designated by the numeral 2:. The upper enlarged portion of each plate is formed with a' substantially hexagonal opening and the openings are arranged in alinement with each other to accommodate the hexagonal outer end portion 18 of theworm shaft 17. The purpose of spacing theupper larger portions of the plates is to provide a means to accommodate the relatively small ratchet wheel 26 and this ratchet wheel is also formed with a hexagonal opening 27 to accommodate the hexagonal outer end portion 18 of the worm shaft 17. A pivoted dog 28 is arranged between the plates for cooperation with the teeth of the ratchet wheel 26 to prevent rotation of the same in one direction as is clearly illustrated in Figure 10.

A rod 29 has its inner end fitted in the rear end portion of the block comprising the top section 2 of the head stock 1 and this rod extends outwardly adjacent the intermediate portion of the pawl 2a. This rod providesa means for attaching the free ends of a spring member 30 which spring member has a portion thereof extending around the hexagonal portion 18 of the worm shaft 17 on opposite sides of the pawl 24. The intermediate portion of this spring member is bent downwardly for disposition against the rear side of the pawl 24 and this is clearly illustrated in Figures 1, 2 and 4 of the drawings. This spring member 30 normally urges the smaller end or the pawl into engagement with the teeth of the ratchet member 21. It is of course to be understood that the plates 25 comprising the pawl 24 are secured together so that the same will operate simultaneously and furthermore due to the shape of the outer end of the worm shaft, said pawl will operate simultaneously therewith.

The operation of my improved commutator truing device may be briefly stated as follows lVhen the parts are arranged as shown in Fig ure 1 of the drawings, it will be readily obvious that when the handles 8 are moved in one direction, the head stock 1 will revolve about the armature shaft A. and during such movement, the pawl 24 being in engagement with the teeth of the ratchet member 21 will impart rotary movement to the worm shaft 17 and the worm 20 carried thereby will in turncooperate with the teeth 15 of the bar 10 whereby to feed the carriage forwardly thus moving the cutter 12 forwardly along the peripheral face of the commutator and this will provide means whereby a step by step movementwill be imparted to the feeding mechanism to insure the proper cutting of the commutator whereby the latter may be trued and all rough surfaces removed from the peripheral face thereof. J

The simplicity of my commutator truing device will save conside able time and labor in the truing up of commutators and furthermore the parts are so arranged as to enable.

the device to be easily and accurately assem bled or disassembled. Furthermore, whenever it becomes necessary to increase the height of the stock worm in order to accoinodate commutators of different diameters, there may be provided for use with the stock bolt 6. I

It will thus be seen from the foregoing de- I scription, that I have provided a commutator truing device which will at all times be positive an defficient for carrying. out the purposes for which it is designed.

While I have shown the preferred embodiment of my invention, it is to be understood that various changes in the size, shape and arrangement of parts maybe resorted to without departing from the spirit or sa rifieing any of the advantages of the appended claim.

hat I claim is: I

In a commutator truing device comprising a head stock adapted for rotation on the armature shaft, the upper portion of the head stock beingbifurcated in longitudinal respect to the armature shaft, to provide a pairof upstanding spaced furcations, the opposed faces of the furcations being formed with grooves,

an, elongated tool carrier, said carrier provided with a longitudinally extending rib, at

opposite sides thereof for sliding engagement within said grooves, a rackprovided at the bottom of the carrier, a worm mounted for rotation between the furcations and in mesh with said rack, and means connecting the ar- 

